We have received more orders for the “Z f/Z f 40mm f/2 (SE) Lens Kit” than expected, so it may take some time for delivery. So thank you in advance for your understanding.Nikon Direct
Selling out so quickly doesn't tell us much without knowing what the original run was. If Nikon has significant inventory, selling out after a week is a very positive sign, but we don't know their initial inventory levels. Still, one can't but see it as a positive sign.